co-mono/packages/coding-agent/examples/extensions/mac-system-theme.ts

/**
 * Syncs pi theme with macOS system appearance (dark/light mode).
 *
 * Usage:
 *   pi -e examples/extensions/mac-system-theme.ts
 */

import { execSync } from "node:child_process";
import type { ExtensionAPI } from "@mariozechner/pi-coding-agent";

function isDarkMode(): boolean {
	try {
		execSync("defaults read -g AppleInterfaceStyle", { encoding: "utf-8" });
		return true; // Returns "Dark" if dark mode
	} catch {
		return false; // Throws if light mode
	}
}

export default function (pi: ExtensionAPI) {
	let intervalId: ReturnType<typeof setInterval> | null = null;

	pi.on("session_start", (_event, ctx) => {
		let currentTheme = isDarkMode() ? "dark" : "light";
		ctx.ui.setTheme(currentTheme);

		intervalId = setInterval(() => {
			const newTheme = isDarkMode() ? "dark" : "light";
			if (newTheme !== currentTheme) {
				currentTheme = newTheme;
				ctx.ui.setTheme(currentTheme);
			}
		}, 2000);
	});

	pi.on("session_shutdown", () => {
		if (intervalId) {
			clearInterval(intervalId);
			intervalId = null;
		}
	});
}